1985 ATC250SX Specifications

General Specs
Model CodeTE04
Product CodeHA6
Frame VIN LocationStamped into right side of frame neck
Engine Serial LocationOn top of right side cover directly under exhaust pipe
Frame Starting NumberJH3TE042*FM000014
Engine Starting NumberTE04E-5000001
Owner Manual31HA6600
Service Manual61HA602
Length1785 mm (70.3 in)
Width1060 mm (41.7 in)
Height1028 mm (40.5 in)
Seat Height720 mm (28.3 in)
Wheelbase1175 mm (46.3 in)
Ground Clearance145 mm (5.7 in)
Dry Weight162 kg (357.2 lb)
Caster Angle21°
Trail22 mm (0.87 in)
Tire & Rim
Front Tire Size (HxW-R)22x11-8
Rear Tire Size (HxW-R)22x11-8
Engine TypeOHC single cylinder 4 stroke air cooled
Cylinder ArrangementSingle cylinder inclined 20 degrees
Valve TrainOverhead camshaft - chain drive
Displacement246 cc (15 ci)
Bore74 mm (2.9 in)
Stroke57.3 mm (2.3 in)
Compression Ratio9:1
Cylinder Compression1128-1324 kPa (164-192 psi)
Horsepower18 PS (17.8 hp)
Torque1.9 kg/m3 (13.7 ft-lb)
Starter TypeElectric starter and forward kick start
Oil Capacity - Total2.5 L (2.6 US qt; 2.2 Imp qt)
Oil Capacity - Oil Change2.1 L (2.2 US qt; 1.8 Imp qt)
Engine Dry Weight46.3 kg (102.1 lb)
Drive Train & Transmission
Clutch TypeAutomatic wet multidisc centrifugal
Transmission Type5 speed constant mesh with reverse
Primary Reduction2.407
First Gear3.615
Second Gear2.000
Third Gear1.400
Fourth Gear1.069
Fifth Gear0.848
Final Reduction4.969
Gear Shift PatternForward: N - SL - 1 - 2 - 3 - 4, Reverse: N - R
Identification MarkQA02A
TypeDual valve
Throttle Bore27 mm (1.1 in)
Main Jet#130
Pilot Jet/Slow Jet#38
Jet Needle Clip Position2nd Groove
Pilot Screw Adjustment2 Turns out
Float Level18.5 mm (0.7 in)
Engine Idle1400 RPM
Fuel Tank Capacity9.8 L (2.6 US gal; 2.2 Imp gal)
Fuel Tank Reserve1.8 L (0.5 US gal; 0.4 Imp gal)
Ignition TypeCDI
CDI Identification MarkCI-67 (HA0)
Spark PlugDR8ES-L (NGK), X24ESR-U (Denso)
Spark Plug Gap Max0.6-0.7 mm (0.024-0.028 in)
Pulse Generator290-360 Ω
Exciter Coil50-200 (Denso), 250-400 (Mitsuba) Ω
Lighting Coil0.2-1 Ω
Ignition Coil Primary0.1-0.3 Ω
Ignition Coil Secondary w/o Cap3700-4500 Ω
Ignition Coil Secondary w/ Cap7400-11000 Ω
Initial Ignition Timing13.0° BTDC
Full Advance Ignition Timing31.0° BTDC
Ignition Advancement TypeElectronic
Voltage12 V
Power TypeFull Wave Rectified DC
Alternator Max Output150 W
Alternator Max Output RPM5000 RPM
Regulator Voltage14-15 V
Front Brake OperationRight hand
Rear Brake OperationLeft hand & right foot
Front Brake TypeCable operated drum
Rear Brake TypeCable operated drum
Front SuspensionTelescopic fork
Rear SuspensionSwingarm
Front Wheel Travel135 mm (5.3 in)
Rear Wheel Travel120 mm (4.7 in)
Front Fork Oil Capacity180 cc (6.1 US fl oz; 6.3 Imp fl oz)

Information on this page is provided in good faith that it is accurate, but in no way is the data guanteed to be accurate. If there are any mistakes, please contact me.